Re: Support for SMBus based GMT G781 and G7811 temperature sensors.

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On Sun, 22 Jan 2012 13:11:36 -0800, Guenter Roeck wrote:
> On Sun, Jan 22, 2012 at 01:43:08PM -0500, Mike Gorchak wrote:
> > Hi All,
> >  
> > I've recently found that lm-sensors doesn't have support for Global Mixed-mode
> > Technology Inc. (GMT) G781 and G7811 temperature sensors.
> >  
> > Overview datasheets are available on manufacturer's site: http://www.gmt.com.tw
> > / , registers datasheet is available here: www.datasheetcatalog.org/datasheets2
> > /35/350422_1.pdf
> >  
> > It seems that this device is registers compatible with ADM1032. SMBus
> > manufacturer id 0x47, device ids 0x01 and 0x03.
>
> Should be safe to add support to the lm90 driver. Jean, any thoughts/comments ?

Indeed the G781 seems compatible with the other chips supported by the
lm90 driver, adding support to that driver sounds good. I'll gladly
review any patch.

> I seem to be unable to find a datasheet for G7811, though. We would need that to know
> its I2C bus address, and for the correct device id (0x03 ?).

GMT have a product sheet for the G7811 so it probably exists:
http://www.gmt.com.tw/product/datasheet/EDS-7811.pdf

Not enough to check for compatibility or write a proper driver though.
But its lack of remote sensor means it can't be fully compatible with
the ADM1032 anyway. Until we receive a formal support request and get a
datasheet (or at the very least a register dump) I think we can just
ignore the G7811.

-- 
Jean Delvare

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